<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>学习CSS</title>
    <style type="text/css">
        .first {
            width: 100px;
            height: 100px;
            background-color: brown;
        }

        .second {
            width: 200px;
            height: 200px;
            background-color: blue;
        }

        #pic {
            text-align: center;
        }

        .description {
            min-width: 450px;
            max-width: 650px;
        }
    </style>

</head>


<body>
    <div class="first">div1</div>
    <div class="second">div2</div>
    <div id="pic">
        <img src="#" alt="">
    </div>
    <div class="description">
        sdjkajvkjnpojvnmalkjvm和您的孙女了解ADMNVFDLSKJMFA;KDSVMO你看浪费大家时间吧VS就;
    </div>
</body>

</html>